Security readout for executives and security teams
Plain-English summary
This vulnerability affects DrayTek Vigor3900, Vigor2960, and Vigor300B devices running firmware before 1.5.1. A remote attacker could trigger memory corruption through an HTTP request and potentially run code on the device. Because these devices often sit at network boundaries, compromise could create serious business risk.
Executive priority
Treat as urgent for any affected DrayTek boundary devices. The issue is remotely reachable, unauthenticated, and rated critical, but the provided sources do not prove active exploitation.
Technical view
CVE-2020-10825 is a stack-based buffer overflow in /cgi-bin/activate.cgi during base64 decoding of the ticket parameter. The CVSS 3.1 score is 9.8, with network attack vector, low complexity, no privileges, no user interaction, and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is most likely where affected DrayTek Vigor3900, Vigor2960, or Vigor300B devices run firmware before 1.5.1, especially if their HTTP management surface is reachable from untrusted networks.
Exploitation context
The provided bundle supports remote code execution via a remote HTTP request. It does not show CISA KEV listing or other evidence of active exploitation, so active exploitation should not be assumed from these sources alone.
Researcher notes
The affected CPE data in the bundle is incomplete, but the CVE description names Vigor3900, Vigor2960, and Vigor300B before 1.5.1. Focus validation on firmware identification, management-plane exposure, and vendor advisory alignment.
Mitigation direction
- Identify Vigor3900, Vigor2960, and Vigor300B devices in the environment.
- Upgrade affected devices running firmware before 1.5.1 per DrayTek guidance.
- Check DrayTek advisory for any model-specific firmware or support notes.
- Limit untrusted access to device HTTP management surfaces where operationally feasible.
- Monitor vendor guidance for any later remediation instructions.
Validation and detection
- Confirm each device model and firmware version through approved administrative channels.
- Flag Vigor3900, Vigor2960, and Vigor300B firmware before 1.5.1 as vulnerable.
- Review logs for unexpected requests to /cgi-bin/activate.cgi without using exploit payloads.
- Verify internet-facing exposure of device HTTP interfaces through asset management data.
- Document upgraded devices and any remaining exceptions.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
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CWE-787: Exact CWE lookup
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Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2020-10825 mapping review
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Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://slashd.ga/2020/03/draytek-vulnerabilities/CVE reference · x_refsource_MISC
- https://www.draytek.com/about/security-advisory/vigor3900-/-vigor2960-/-vigor300b-stack-based-buffer-overflow-vulnerability/CVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Out-of-bounds Write
Out-of-bounds Write represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.